INTRO
In this section, we will listen to seismic data at the 3 stations shown in the map below. They represent close, intermediate, and far distances from the earthquake epicenter.
The Background Noise
Before we listen to the earthquakes, we will first listen to the background noise levels at one of the three stations, P39A, in Salisbury, MO.
- What do you notice about the background noise? Are there any dominant frequencies?